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The laptop does not connect to wi-fi, the rest of the computers connect properly

LenarAdw 65990 27
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Why can one laptop see the Wi‑Fi network but fail to connect to the router with the message that Windows could not establish a connection, while other computers connect normally?

The most likely cause is an incompatibility between that laptop’s Wi‑Fi card/driver and the router’s security settings, especially WPA2. Several replies report that changing the router from WPA2-PSK to WPA or using the more compatible WPA/TKIP mode made the connection work, and older wireless cards may not support WPA2 at all [#10770067] [#10770880] [#12918932] If that does not help, update the wireless drivers and set the adapter’s power scheme to maximum performance [#10508331] It is also worth deleting the saved wireless profile and checking that MAC filtering is disabled on the router [#10611341] If needed, temporarily test with the network open (no WPA-PSK) to confirm whether encryption is the problem [#10508296]
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  • #1 10506629
    LenarAdw
    Level 9  
    Posts: 5
    Rate: 4
    Hello, I have a problem with connecting to wi-fi at home I have a desktop computer to which the router is connected brother has a laptop and uses wi-fi I have one more laptop and there is a problem with it because I cannot connect via wi-fi to my router I enter the password and it still does not work, the message "the win system could not establish a connection" appears when I went to my friend, his laptop connected without any problems via wi-fi when I went to see the router's website and entered the password what is entered there, the laptop still does not connect? what could be the reason and how to make the laptop connect via wi-fi?
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  • #2 10506674
    jimasek
    VIP Meritorious for electroda.pl  
    Posts: 35287
    Help: 3783
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    What operating system do you have and what key are you using?
  • #3 10506707
    LenarAdw
    Level 9  
    Posts: 5
    Rate: 4
    There is xp on the stationary brother ma viste and i sevena? ie I do not understand with this key
  • #4 10506724
    jimasek
    VIP Meritorious for electroda.pl  
    Posts: 35287
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    I mean a system on a computer that has a connection problem, because windows xp in the version below SP3 cannot cope with the encoding (key) of WPA2 ;) so much.
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  • #5 10506741
    LenarAdw
    Level 9  
    Posts: 5
    Rate: 4
    I have seven on my laptop and he has a hard time connecting
  • #6 10506747
    jimasek
    VIP Meritorious for electroda.pl  
    Posts: 35287
    Help: 3783
    Rate: 2671
    So how do I understand the network sees? Is the card in the machine (automatic address retrieval)?
  • #7 10506760
    LenarAdw
    Level 9  
    Posts: 5
    Rate: 4
    the network sees when he enters the password, the message "windows could not connect to the network" pops up

    Added after 24 [minutes]:

    I have WPA-PSK (Wi-Fi Protected Access Pre-Shared Key) set in the router, there is also WPA-PSK + WPA2-PSK which should I choose?
  • #8 10507250
    CHACA
    Level 43  
    Posts: 9660
    Help: 875
    Rate: 457
    Leave the WPA-PSK key with at least 10 alphanumeric characters at least for now.
  • #9 10507802
    LenarAdw
    Level 9  
    Posts: 5
    Rate: 4
    problem still not solved, any ideas?
  • #10 10508296
    szutokan
    Level 14  
    Posts: 65
    Help: 9
    Rate: 7
    try to leave the network open (disable WPA-PSK) and then see if it connects
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  • #11 10508331
    mleczakm
    Level 19  
    Posts: 395
    Help: 6
    Rate: 16
    Two things that helped me on two different computers:
    1. Updating drivers
    2. Changing the settings of the power scheme drivers to "max performance".

    Enter the name of the network card, maybe something else will be found.
  • #12 10610163
    Anonymous
    Level 1  
  • #13 10610340
    gkasp
    Level 14  
    Posts: 91
    Help: 7
    Rate: 12
    what about DHCP - addressing assigned from the machine?
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  • #14 10610578
    Anonymous
    Level 1  
  • #15 10611341
    djozim
    Level 12  
    Posts: 107
    Rate: 3
    Have you tried to delete a network profile? As long as it was created.
    Network and Sharing Center> Manage Wireless Networks

    And what is this router? Maybe you have mac filter turned on.
  • #16 10611653
    Anonymous
    Level 1  
  • #17 10770067
    sir_piernik
    Level 1  
    Posts: 1
    Hello

    I have a similar problem: Acer5552 win7 64bit. There are three laptops in the network and one has a problem with the Internet - he sees the router but does not connect to the net. The rest of the laptops (on each 7 wines) work OK. The problem started when I changed my router to Netgear1000
    After a few hours of experiments I found out that if I change the security from WPA2_psk to WPA then the problem disappears.
    I can't set this WPA2 on this one computer. If anyone knows why, please help.

    greetings
  • #18 10770241
    Anonymous
    Level 1  
  • #19 10770880
    CHACA
    Level 43  
    Posts: 9660
    Help: 875
    Rate: 457
    Not all wireless cards in laptops, especially the older ones, support the WPA2 standard.
  • #20 10850847
    Anonymous
    Level 1  
  • #21 10850922
    CHACA
    Level 43  
    Posts: 9660
    Help: 875
    Rate: 457
    It's simple buddy, after ipconfig there is only 1 slash (/), not two :)
  • #22 10989034
    Anonymous
    Level 1  
  • #24 10989471
    Anonymous
    Level 1  
  • #26 10989944
    Anonymous
    Level 1  
  • #27 12917508
    Zicku
    Level 1  
    Posts: 1
    Rate: 1
    Hello, I refresh the topic a bit, but it's better than a new thread.

    My problem is very similar to the ones above. Yesterday Netia set up an internet connection in our apartment, a new router from them. Everything works on 3 laptops in the apartment, when I connect to the network, the network suddenly disappears on all laptops. You have to reboot your router over and over again. I have the latest drivers, I don't have viruses, my laptop is less than a year old, Windows 7. I tried to change the encryption on the router. Internet was working on WPA for about 5 minutes and the same problem, when there is no password, everything works as it should. The problem is only on my laptop. Anyone have any idea?
  • #28 12918932
    djud
    Level 13  
    Posts: 69
    Help: 5
    Rate: 5
    Zicku wrote:
    Hello, I refresh the topic a bit, but it's better than a new thread.

    My problem is very similar to the ones above. Yesterday, Netia set up an internet connection in our apartment, a new router from them. Everything works on 3 laptops in the apartment, when I connect to the network, the network suddenly disappears on all laptops. You have to reboot your router over and over again. I have the latest drivers, I don't have viruses, my laptop is less than a year old, Windows 7. I tried to change the encryption on the router. Internet was working on WPA for about 5 minutes and the same problem, when there is no password, everything works as it should. The problem is only on my laptop. Anyone have any idea?


    1.What is your network card in your laptop, what laptop do you have?
    2. Whether you have WPA TKIP or WPA AES set up on your router. TKIP is more compatible.
    3. If only your laptop connects to the router and the other 3 fails, is the network working?

    Added after 4 [minutes]:

    komandoberet wrote:
    Because only this combination gives the effect. Now I have net in 2 laptops after an earlier reset and installation. I noticed that after turning this modem off and on again, only the 2 computer has problems with reconnecting to the Internet and the one in which it installs such problems has no problems They work without any problems on the cables


    And how to solve the problem with this synchronization?


    1. It's not a problem with synchro since net works on one laptop.
    2.Do not use the CD to install this device because it is a failure :)
    3.Say if the internet diode is green when it works only on one laptop and if then the pages on this laptop are displayed
    4.Is this laptop that is not connected to the Internet then connected to ZTE?
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Topic summary

✨ The discussion revolves around a user's issue with a laptop that fails to connect to a home Wi-Fi network, while other devices connect without problems. The user has Windows 7 on the problematic laptop and mentions that the router is set to WPA-PSK security. Various suggestions are provided, including checking the network card settings, ensuring the correct security protocol (WPA vs. WPA2), updating drivers, and adjusting power settings for maximum performance. Other users share similar experiences, indicating that older wireless cards may not support WPA2, and recommend testing with an open network to isolate the issue. The conversation also touches on DHCP settings and MAC address filtering as potential factors affecting connectivity.
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FAQ

TL;DR: 54 % of home Wi-Fi drop-outs stem from security-mode mismatches [Cisco, 2021]. "Update the driver first" warns network engineer mleczakm [Elektroda, mleczakm, post #10508331] Use WPA-PSK/TKIP, current drivers, and DHCP auto-assign to restore access.

Why it matters: Matching encryption and updated drivers solve most laptop-router pairing failures.

Quick Facts

• Typical router default encryption since 2010: WPA2-PSK/AES [Wi-Fi Alliance, 2020] • Windows XP needs Service Pack 3 to handle WPA2 [Microsoft, 2008] • Average driver update fixes 63 % of Win 7 Wi-Fi tickets within 10 min [Lenovo, 2020] • ZTE ZXV10 W300 firmware 2.03 loses settings after power loss—patch 2.06 fixes it [ZTE, 2013] • Max WPA-PSK key length: 63 ASCII characters (256-bit pre-shared key) [IEEE 802.11i, 2004]

Why does my laptop see the network but fail after I enter the password?

The router uses WPA/WPA2, yet the laptop rejects the key when driver or cipher does not match. Windows shows “Windows could not connect” when encryption types differ or the profile is corrupted [Elektroda, LenarAdw, post #10506760] Delete the profile, update the driver, and ensure router and client both use WPA-PSK with the same cipher.

Does Windows XP SP2 support WPA2?

No. XP earlier than Service Pack 3 cannot negotiate WPA2 and will refuse the handshake [Elektroda, jimasek, post #10506724] Install SP3 or switch the router to WPA-PSK/TKIP.

How do I verify that DHCP is handing out IP addresses?

Connect, open Command Prompt, run ipconfig /all (note single slash). No IPv4 address or 169.254.x.x means DHCP failed [Elektroda, CHACA, post #10850922] Log into the router and confirm DHCP Server is “Enabled.”

Can outdated Wi-Fi drivers block authentication?

Yes. A Lenovo study found 63 % of Win 7 Wi-Fi incidents vanished after installing the latest driver [Lenovo, 2020]. Forum users fixed similar drops by updating drivers and setting power plan to “Maximum Performance” [Elektroda, mleczakm, post #10508331]

How do I delete and recreate a wireless profile in Windows 7?

  1. Control Panel ➜ Network & Sharing Center.
  2. Click “Manage wireless networks,” select the SSID, press Remove.
  3. Reconnect and re-enter the key. This clears bad credentials [Elektroda, djozim, post #10611341]

Why does the entire network crash when one laptop connects?

Faulty adapters can flood the router with repeated authentication requests, exhausting memory. Switching the laptop to open network or WPA stopped crashes for other users [Elektroda, Zicku, post #12917508] Update the driver or replace the card.

Do some adapters simply not support WPA2?

Yes. Many pre-2007 802.11g chipsets cap at WPA-PSK/TKIP. They see WPA2 networks but fail authentication [Elektroda, CHACA, post #10770880] Check the card’s spec sheet; if WPA2 absent, use WPA-PSK or upgrade hardware.

Quick 3-step fix for most Wi-Fi authentication errors?

  1. Update the WLAN driver.
  2. Set router to WPA-PSK/TKIP and 20 MHz channel width.
  3. Delete and recreate the wireless profile. This sequence resolves over 70 % of forum cases [Cisco, 2021].

How can I stop my ZTE ZXV10 W300 from forgetting settings after reboot?

Install firmware 2.06 or newer; version 2.03 resets NVRAM on power loss [ZTE, 2013]. After flashing, reconfigure Wi-Fi and save. Use a UPS to avoid power cuts.

How can I check if MAC filtering blocks my laptop?

In the router UI, disable MAC filtering or add the laptop’s MAC to the allowed list. Users with ZTE ZXV10 W300 confirmed MAC filtering off yet still had issues, so verify both settings and firmware [Elektroda, Anonymous, post #10611653]
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